21344238 has 12 divisors (see below), whose sum is σ = 46245888. Its totient is φ = 7114740.

The previous prime is 21344237. The next prime is 21344243. The reversal of 21344238 is 83244312.

21344238 is a `hidden beast` number, since 213 + 442 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592878 + ... + 592913.

It is an arithmetic number, because the mean of its divisors is an integer number (3853824).

Almost surely, 2^21344238 is an apocalyptic number.

21344238 is an abundant number, since it is smaller than the sum of its proper divisors (24901650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344238 is a wasteful number, since it uses less digits than its factorization.

21344238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185799 (or 1185796 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21344238 is about 4619.9824674992. The cubic root of 21344238 is about 277.3917571508.

The spelling of 21344238 in words is "twenty-one million, three hundred forty-four thousand, two hundred thirty-eight".